I was on Seroquel and NAC together for a while. The hair pulling got...well, I became more obsessive about it, and would spend hours selecting the hairs that I would pull, but in quantitative terms, I pulled less. I wouldn't say that it was good for me, and eventually my psychiatrist pulled me off because there were some issues regarding my Lupus. I would not recommend trying them together at first, but again, in quantitative terms, I did end up pulling less. Perhaps you'll have different side effects, but I just wanted to share.

Oh, and my cousin also has trich and took NAC alone. She said that it's dulled down when she takes other meds along side it, but that it helps by itself quite a bit.